Feature: Shared pacman options installed via system/install.sh

Enables Color through an Include snippet in /etc/pacman.d so pacman
options stay in sync between machines.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

system/install.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# Installs system-level config that stow can't manage (needs root).
+set -euo pipefail
+
+repo="$(cd "$(dirname "$0")" && pwd)"
+
+# pacman: shared [options] snippet
+sudo install -m644 "$repo/pacman/options.conf" /etc/pacman.d/options.conf
+if ! grep -q '^Include = /etc/pacman.d/options.conf' /etc/pacman.conf; then
+    sudo sed -i '/^\[options\]/a Include = /etc/pacman.d/options.conf' /etc/pacman.conf
+fi

system/pacman/options.conf

@@ -0,0 +1,5 @@
+# Shared pacman [options], included from /etc/pacman.conf.
+# Installed to /etc/pacman.d/options.conf by system/install.sh.
+Color
+#ILoveCandy
+#VerbosePkgLists